The factory alarm is not enough. it really only honks the horn and flashes the lights for about 30 seconds. When you live in larger cities you here a dozen of these alarms a day and no one listens.
I have compustar 2 way alarm in mine. But I still don't put a lot of faith in them. If someone wants whats in your car bad enough they will take it alarm or no alarm.
It hurts when you put so much time and effort into your ride and someone disrespects it and you but when you think about it there really is nothing that you can do except sit in your car all day...and even then someone may still HIT you..
Oh well try to keep your head up Saki, at least you still have the car and no one was hurt.